how can i add nmy payment account?

If you want to integrate your form with any of our payment gateways, you simple need to have your credentials of the payment gateway you want to use(PayPal, Stripe, Authorize.net etc).  Please check this guides: 

https://www.jotform.com/help/47-Order-Form-Basics 

https://www.jotform.com/help/165-Setting-Up-Your-First-Order-Form 

Let us know if you are having any issues on this, or if this is not what you are referring to, please explain what you need.